我厂铆焊车间使用的一台19mm×2000mm卷板机,因其本身缺陷及负荷较满,负载较大,产生上辊轴颈断裂事故(图1),而造成卷板机无法工作,严重影响了生产.因此需要尽快、优质的修好这台设备.1 修理方案的选择将断裂的轴颈采用焊接修复法进行连接,因材料为50Mn,碳当量高,可焊性差,轴颈断裂处为中(?)125mm,而断裂处为弯距最大的危险截面,此方案没有把握. A 19mm × 2000mm Bending Machine used by our factory in Riveting Workshop, due to its own defects and full load, large load, resulting in upper roll neck fracture (Figure 1), resulting in the coiling machine can not work, serious Affecting the production.Therefore, as soon as possible, the need to repair the equipment of good quality.1 The choice of repair program Fracture journal welded connection repair method, because the material is 50Mn, high carbon equivalent, poor weldability, journal breakage at (?) 125mm, and the fracture is the largest dangerous section of the bending section, this program is not sure.